JP2006234030A - Connection structure of rotary shaft body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection structure of a rotary shaft body capable of easily carrying out connection/separation of the rotary shaft body. <P>SOLUTION: An opening groove 5 having a nearly V-shaped cross-section is formed on an outer peripheral surface of respective rotary shaft bodies 1, 2 along the axial direction. A connection shaft part 1b is formed at a connection end part of the rotary shaft body 1 and a connection hole part 9 for faucet fitting to the connection shaft part 1b is formed at a connection end part 2a of the rotary shaft body 2. A recessed step part 7 is formed on an outer peripheral surface of the connection shaft part 1b and a projected step part 10 for faucet fitting to the recessed step part 7 of the connection shaft part 1b on an inner peripheral surface of the connection hole part 9. Engaging slope parts 11, 12 facing in the circumferential direction when the connection shaft part 1b and the connection hole part 9 are faucet fitted and the recessed step part 7 and the projected step part 10 are faucet fitted and mutually wedge-engaging for one to be pressed by the other by turning either rotary shaft body 1 to a predetermined rotational direction on the connection shaft part 1b side and the connection hole part 9 side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a connecting structure for rotating shaft bodies such as gun drills and reamers used for deep hole cutting, for example, and more particularly to a connecting structure suitable for a rotating shaft body having a relatively small diameter.

  As a conventional connecting structure of this type of rotating shaft body, publicly known documents such as patent publications cannot be specifically cited. For example, a shank configured to connect a drill head of a gun drill and a shank, or to be divided into a plurality of parts. Conventionally, a connecting structure using screws is mainly used to connect the two.

  For example, the simplest structure as a screw connection structure when connecting a drill head and a shank is to form the connecting end of the drill head into a bolt-shaped male screw, and the connecting end of the shank into a nut. Thus, the nut-like connecting end portion of the shank is screwed into the bolt-like connecting end portion of the drill head and tightened.

  The screw connection structure is such that the drill head side of the gun drill is rotated clockwise in the same direction as the rotation direction with respect to the shank, so that both are tightened and connected together. In many cases, the head is excessively tightened against the shank, and when the drill head is replaced due to damage to the cutting edge of the drill head, the screw portion is not loosened, which makes it very difficult to remove the drill head.

  An object of the present invention is to provide a connecting structure of rotating shaft bodies that can easily and easily perform a connecting operation of both rotating shaft bodies to be connected and a disconnecting operation of both rotating shaft bodies connected to each other.

  Means for solving the above problems will be described with reference numerals in the embodiments described later. The connecting structure of rotating shaft bodies according to the first aspect of the present invention is the rotating shaft bodies 1, 2 to be connected. Opening grooves 5 and 8 having a substantially V-shaped cross section along the axial direction are formed at least on the outer peripheral surface of the connecting end, and the connecting end of one rotary shaft 1 has a diameter smaller than that of the shaft 1. A shaft portion 1b is formed, and a connecting hole portion 9 is formed in the connecting end portion 2a of the other rotating shaft body 2 so as to fit into the connecting shaft portion 1b. On the outer peripheral surface of the connecting shaft portion 1b, A concave step 7 or a convex step is formed, and a convex step 10 or a concave step that fits into the concave step 7 or the convex step of the connecting shaft portion 1b on the inner peripheral surface of the coupling hole 9 is provided. The connecting shaft portion 1b and the connecting hole portion 9 are fitted in the base end portion of the connecting shaft portion 1b and the distal end portion of the connecting hole portion 9, and a concave step portion is formed. One of the rotating shaft bodies 1 and 2 protrudes in the circumferential direction when they are fitted in the inlay, and one of the rotating shaft bodies 1 and 2 rotates in the predetermined rotating direction of the rotating shaft bodies 1 and 2 to thereby rotate one rotating shaft body. Engagement inclined surface portions 11 and 12 that engage with each other so that 1 is pushed with respect to the other rotating shaft 2 are provided.

  According to a second aspect of the present invention, in the connecting structure for rotating shaft bodies according to the first aspect, the engaging inclined surface portions 11 and 12 are formed along a helical winding centered on the central axis O of the rotating shaft bodies 1 and 2. It is characterized by.

  The effect of the invention by the above-described solution means will be described with reference numerals in the embodiments described later. According to the invention according to claim 1, in order to connect both rotary shaft bodies 1 and 2, one rotation The connecting shaft portion 1b of the shaft body 1 is fitted into the connecting hole portion 9 in the connecting end portion 2a of the other rotating shaft body 2 by using the opening groove 8, and is fitted into the slot, and the convex step portion 10 and the recessed step portion 7 are in-fitted, and when either one of the rotating shaft bodies 1 and 2 is rotated in the predetermined rotational direction of the rotating shaft bodies 1 and 2, both engaging slope portions 11 and 12 are engaged. As a result of the wedge engagement, one rotating shaft body 1 is pushed against the other rotating shaft body 2, so that the relative rotation of both rotating shaft bodies 1 and 2 is prevented, and convex steps that are inlay-fitted with each other. The axial movement between the rotating shaft bodies 1 and 2 is prevented by the portion 10 and the concave step portion 7, thereby Shaft 1 and 2 are integrally connected. Accordingly, both the rotary shaft bodies 1 and 2 can be easily and easily connected.

  Further, when the rotary shaft bodies 1 and 2 that are connected to each other as described above are disconnected, either one of the rotary shaft bodies 1 or 2 is turned in a direction opposite to the predetermined rotation direction of the rotary shaft bodies 1 and 2. Since the rotary shaft body 1 has only to be pulled out from the opening groove 8 to the side thereof, both rotary shaft bodies 1 and 2 can be easily and easily separated.

  As described above, only when both the rotary shaft bodies 1 and 2 are coaxially connected and rotated by the required driving means, the engaging slope 11 on the rotary shaft 1 side and the rotary shaft body 2 side are Since the engagement slope portion 12 is in a pressure contact state with each other, and the rotation drive by the driving means is stopped, the pressure contact state between the engagement slope portion 11 and the engagement slope portion 12 is released. , 2 is much easier and easier than the conventional screw connection structure.

  According to the second aspect of the present invention, the engaging slope portions 11 and 12 are almost in close contact with each other, and the tightening action between the rotating shaft body 1 and the rotating shaft body 2 can be sufficiently exerted. Can be linked accurately.

An embodiment in which the connecting structure of rotating shaft bodies according to the present invention is implemented in a gun drill of a deep hole cutting tool will be described below with reference to the drawings. FIG. 1 is a side view of the entire gun drill, and FIG.
Is a side view of the drill head of the gun drill, (b) is an end view of the drill head as viewed from the arrow a, (c) is a side view of the drill head from the arrow b, and (d) is a drill head from the arrow b. Fig. 3 (a) is a sectional view of the knee line of Fig. 3 (a), Fig. 3 (a) is a perspective view of the drill head as viewed from the opening groove side, and Fig. 3 (b) is a connecting end of the drill head. It is the perspective view which looked at the part from the opposite side to the opening groove side. 4A is a side view of the gun drill shank viewed from the opening groove side, FIG. 4B is an end view of the shank viewed from the arrow E side, and FIG. 4C is a side view of the shank viewed from the arrow head. (d) is a sectional view taken along the tote line of (a), and (a) in FIG. 5 is a perspective view of the shank as viewed from the opening groove side, and (b) is a view of the shank from the side opposite to the opening groove side. FIG.

  1 to 5, 1 is a drill head (rotating shaft), 2 is a shank (rotating shaft), 3 is a screwdriver provided at the base end of the shank 2, and 4 is a coolant supply pipe on the shank 2 side. is there.

  This drill head 1 rotates in the right direction to make a hole in a work material. As shown in FIGS. 2 and 3, the head body 1a has a large diameter and is smaller in diameter than the head body 1a. And a connecting shaft portion 1b extending coaxially from the rear end of the head body portion 1a. The outer peripheral surfaces of the head body portion 1a and the connecting shaft portion 1b are substantially V-shaped in section along the axial direction thereof. An opening groove 5 is formed, and a coolant supply pipe 6 is formed along the central axis O from the rear end surface of the connecting shaft 1b to the head main body 1a. The front end of the pipe 6 is the head main body. It communicates with a coolant discharge port 24 opened at the tip end surface of the portion 1a. Further, a cemented carbide tip 25 and a guide pad 26 forming a cutting blade are fixed to the distal end side of the head main body 1a, and a concave step portion 7 is provided at the axial center of the outer peripheral surface of the connecting shaft 1b. It is installed.

  On the outer peripheral surface of the shank 2, an opening groove 8 having a substantially V-shaped cross section similar to the opening groove 5 on the drill head 1 side is formed along the axial direction. The connecting end 2a, which is the tip of the shank 2, is formed with a connecting hole 9 that fits into the connecting shaft 1b of the drill head 1 and this connecting hole 9 On the inner peripheral surface of the drill head, a convex step portion for restricting the axial movement of the drill head 1 and the shank 2 by fitting with the concave step portion 7 of the drill head 1 when the drill head 1 and the shank 2 are connected. 10 is formed. A hollow portion 13 for inserting a coolant supply pipe is formed along the central axis O inside the shank 2, and a coolant supply pipe 4 as schematically shown in FIG. 1 is inserted into the hollow portion 13.

  The base end portion of the connecting shaft portion 1b in the drill head 1 and the front end portion of the connecting hole portion 9 in the shank 2 (the front end portion of the connecting end portion 2a) are connected to the connecting shaft portion 1b and the connecting hole. When the portion 9 is fitted with the spigot and the concave step portion 7 and the convex step portion 10 are fitted with the spigot portion, they face each other in the circumferential direction, and either the drill head 1 or the shank 2 faces the predetermined rotation direction of the gun drill, that is, the right Engagement slopes 11 and 12 are provided to engage with each other so that one rotating shaft 1 pushes against the other rotating shaft 2 by turning in the direction.

  As shown in FIGS. 2A, 2C, 3D, 3B, and 7, the engaging slope 11 on the drill head 1 side is the base end of the connecting shaft 1b. In detail, it is formed at the boundary step between the head main body 1a and the connecting shaft 1b. Specifically, it is a spiral winding with a twist angle of 45 °, for example, centered on the central axis O of the drill head 1. It is formed along.

  Further, as can be seen from FIGS. 4 (c), 4 (d), 5 and 7, the engaging slope portion 12 on the shank 2 side is the tip end portion of the connecting hole 9, that is, the tip end surface side of the shank 2. In detail, the engagement inclined surface portion 12 is also similar to the engagement inclined surface portion 11 on the drill head 1 side, and more specifically, the central axis O of the shank 2 (the same as the central axis of the head main body portion 1a). It is formed so as to be along a spiral winding having a twist angle of 45 ° centering on the central axis).

  The opening groove 5 formed on the drill head 1 side and the opening groove 8 formed on the shank 2 side have a function of discharging cutting waste, respectively, and in connecting the drill head 1 and the shank 2 in FIG. The connecting shaft 1b of the drill head 1 is connected to the shank 2 from the state where the connecting shaft 1b of the drill head 1 is arranged in parallel to the side of the connecting end 2a of the shank 2 as shown in FIG. Some have a function of being inserted into the hole 9. The opening grooves 5 and 8 are formed so that the opening angle θ from the central axis O of each of the drill head 1 and the shank 2 is about 110 °.

  Thus, in order to insert the connecting shaft portion 1b of the drill head 1 into the connecting hole portion 9 of the shank 2, as can be seen from FIGS. When the opening width is W and the minor axis of the connecting shaft portion 1b is N, it is necessary that W> N. Further, the opening angle θ of the opening grooves 5 and 8 may be in the range of 90 ° to 150 °.

  In order to connect the connecting shaft 1b of the drill head 1 to the tip 2a (connecting end) of the shank 2 configured as described above, the drill head 1 is brought in parallel to the tip 2a of the shank 2. As shown in FIG. 6 (a), the drill head in the direction indicated by the arrow in the figure with the minor axis N side of the connecting shaft portion 1b of the drill head 1 facing the opening groove 8 of the shank 2 1 is brought close to the shank 2 in parallel and the connecting shaft 1b of the drill head 1 is inserted into the connecting hole 9 of the shank tip 2a, and the drill head 1 is moved in the direction of the arrow shown in FIG. By rotating, the protruding step portion 10 of the connecting hole portion 9 is fitted into the concave step portion 7 of the connecting shaft portion 1b, and the connecting shaft portion 1b is fitted into the connecting hole portion 9 inlay.

  As described above, the connecting shaft portion 1b of the drill head 1 fits into the connecting hole portion 9 of the shank tip 2a, and the concave step portion 7 of the connecting shaft portion 1b and the convex step portion of the connecting hole portion 9 are provided. 10 is engaged with an inlay, the engaging slope portion 11 formed at the base end portion of the connecting shaft portion 1b and the engagement formed at the shank tip portion a (the tip portion of the connecting hole portion 9). Since the inclined surface portion 12 faces the circumferential direction, either the drill head 1 or the shank 2 in this state, in this case, when the shank 2 side is rotated to the right, which is the predetermined rotation direction of the gun drill, As shown in FIG. 7, the shank 2 side engaging slope portion 12 is wedge-engaged with the drill head 1 side engaging slope portion 11, and the shank 2 side pushes against the drill head 1. The drill head 1 is connected coaxially to the tip 2a of 2 It is.

  6 (a) to 6 (c), α indicates the formation range of the engaging slope portion 11 formed on the drill head 1 side, and β indicates the engaging slope portion formed on the shank 2 side. 12 shows the formation range. In FIG. 6 (c), α and β are in an overlapped state. Therefore, the engagement slope 11 on the drill head 1 side is wedge-engaged with the engagement slope 12 on the shank 2 side. The state where the shank 2 side is pushed with respect to the drill head 1 is shown.

  On the other hand, as can be seen from FIG. 7, since the concave step portion 7 of the connecting shaft portion 1b and the convex step portion 10 of the connecting hole portion 9 are inlay-fitted, the drill head 1 is moved in a predetermined rotational direction of the gun drill. When the drilling head 1 itself is pressed against the shank 2, the drilling head 1 itself is pressed against the shank 2 and the engaging slope 11 is pushed to the shank 2 side. Pushed in the axial direction, the rear end surface 14 of the concave step portion 7 on the connecting shaft portion 1b is wedge-engaged with the rear end surface 15 of the convex step portion 10 on the connecting hole 9 side of the shank 2, The axial movement of the drill head 1 relative to the shank 2 is prevented.

  Thereby, the drill shaft 1 is connected so that the connecting shaft portion 1b cannot move in the axial direction with respect to the tip portion 1a of the shank 2 and cannot relatively rotate. In this manner, with the connecting shaft portion 1b of the drill head 1 integrally connected to the distal end portion 1a of the shank 2, the drill head 1 is moved to the shank by rotating the driver 3 at the base end portion of the shank 2 to the right. Rotate together with 2 to perform drilling. The coolant supply pipe 4 fitted into the hollow portion 13 of the shank 2 and the coolant supply line 6 of the drill head 1 are connected to each other by the connection between the drill head 1 and the shank 2.

  In order to remove the drill head 1 connected to the tip 1a of the shank 2 as described above, the drill head 1 is rotated leftward, which is the direction opposite to the predetermined rotation direction of the gun drill, as shown in FIG. Since the drill head 1 has only to be pulled out from the opening groove 8 to the side thereof from the state shown in FIG.

  In this gun drill, as described above, the drill head 1 is engaged only when the drill head 1 is coaxially connected to the distal end portion 1 a of the shank 2 and is rotated by the driver 3 at the proximal end portion of the shank 2. When the slope 11 and the engagement slope 12 of the shank 2 are wedge-engaged and pressed against each other, and the rotational drive by the driver 3 is stopped, the engagement slope 11 and the engagement slope 12 Since the pressure contact state is released, the removal operation of the drill head 1 is much simpler and easier than the conventional screw type connection structure or key type connection structure.

  Also, as described with reference to FIGS. 6A to 6C, the mounting operation of the drill head 1 when connecting the drill head 1 to the shank 2 can be performed simply and easily as described above with reference to FIGS. it can.

  In the embodiment described above, the engagement slope portion 11 on the drill head 1 side and the engagement slope portion 12 on the shank 2 side are along the spiral winding centering on the central axis O of the drill head 1 and the shank 2. Although it forms, the engagement slope parts 11 and 12 may be formed in a linear slope. However, by making the engaging slope portions 11 and 12 along the helical winding as in this embodiment, both the engaging slope portions 11 and 12 are almost in close contact with each other, and the drill head 1 and the shank 2 are in close contact with each other. Can be sufficiently exerted, and both can be accurately connected.

  Moreover, in the above-mentioned embodiment, since the connection structure of this invention is implemented in the gun drill of the deep hole cutting tool, although the opening grooves 5 and 8 are formed over the full length of the drill head 1 and the shank 2, In the case of a simple rotating shaft body connecting structure, the opening groove may be formed only at the connecting end of the rotating shaft body.

  In the above-described embodiment, the concave step portion 7 is formed on the outer peripheral surface of the connecting shaft portion 1b, and the convex step portion 10 is formed on the inner peripheral surface of the connecting hole portion 9. The convex step 10 may be formed on the outer peripheral surface of 1b, and the concave step 7 may be formed on the inner peripheral surface of the connecting hole 9. Further, the convex step portion 10 and the concave step portion 7 are not limited to one place, but may be formed at two places or three places, respectively.

It is a side view of the whole gun drill. (a) is a side view showing the drill head of a gun drill, (b) is an end view of the drill head viewed from the arrow a, (c) is a side view of the drill head viewed from the arrow b, and (d) is a drill head. A side view seen from the arrow B, (e) is a sectional view of the knee line (a). (a) is the perspective view which looked at the drill head from the opening groove side, (b) is the perspective view which looked at the connection end part of the drill head from the opposite side to the opening groove side. (a) is a side view of the gun drill shank viewed from the opening groove side, (b) is an end view of the shank viewed from the arrow e side, (c) is a side view of the shank viewed from the arrow head, and (d) is a side view of the shank. It is a sectional view taken along the tote line (a). (a) is the perspective view which looked at the shank from the opening groove side, (b) is the perspective view which looked at the shank from the opposite side to the opening groove side. It is explanatory drawing explaining the state which connects a drill head to a shank front-end | tip part. It is a partial cross section side view in the state where the drill head was connected to the shank tip.

Explanation of symbols

1 Drill head (rotating shaft)
1a head body 1b connecting shaft 2 shank (rotating shaft)
2a Shank tip (connection end)
5 Opening groove 7 Concave step 8 Opening groove 9 Connecting hole 10 Convex step 11 Engagement slope part 12 on the drill head side Engagement slope part on the shank side

Claims (2)

  An opening groove having a substantially V-shaped cross section is formed in the axial direction on at least the outer peripheral surface of each of the rotating shaft bodies to be connected, and the diameter of the rotating end of the one rotating shaft body is larger than that of the shaft body. A small connecting shaft portion is formed, and a connecting hole portion is formed in the connecting end portion of the other rotating shaft body so as to fit into the connecting shaft portion. A concave step is formed on the outer peripheral surface of the connecting shaft portion. A convex stepped portion or a concave stepped portion that fits into a concave stepped portion or a convex stepped portion of the connecting shaft portion is formed on the inner peripheral surface of the connecting hole portion. The base end portion of the shaft portion and the distal end portion of the connecting hole portion are circumferential when the connecting shaft portion and the connecting hole portion are inlay-fitted and the concave step portion and the convex step portion are inlay-fitted. Facing each other and turning one of the two rotary shafts in a predetermined rotation direction of the rotary shaft so that one of the rotary shafts pushes against the other rotary shaft. Connecting structure of the rotary shaft member formed by providing the engagement inclined surface portion to be engaged. 2. The connecting structure of rotating shaft bodies according to claim 1, wherein each engaging slope portion is formed along a spiral winding centering on the central axis of the rotating shaft body.

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